Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 20, Pages 8515-8522Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b03190
Keywords
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Funding
- National Natural Science Foundation of China [11704079, 11874125, 11774071, 21607029, 21777033]
- Science and Technology Program of Guangzhou [201804010451, 201904010104]
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The thermal decomposition products and kinetics of two typical organic-inorganic halide perovskites, CH3NH3PbI3 (MAPbI(3)) and HC(NH2)(2)PbI3 (FAPbI(3)), were investigated via simultaneous thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. NH3 and CH3I were verified as the major thermal decomposition gases of MAPbI(3). Furthermore, for the first time, methane (CH4) was observed as a thermal degradation product of MAPbI(3) at elevated temperatures. In contrast to conventional wisdom, (HCN)(3) (trimerized HCN) and NH3 were demonstrated as the major gaseous decomposition products of FAPbI(3) at lower temperatures, while HCN and NH3 became dominant at high temperatures (>360 degrees C). The hybrid experimental/theoretical results presented in this study will further our understanding of the perovskite decomposition mechanism and provide new insights into designing of long-term stable perovskite-based devices.
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